Apparatus for controlling pumping-engines.



Patented Dec. I6, I902.

R. WRIGHT.

APPARATUS FOR CONTROLLING PUMPING ENGINES.

(Application filed Apr. 4, 1902.).

2 Sheets$heet I.

(No Model.)

WWW

Patented Dec. I6, 1902.

B. WRIGHT. APPARATUS FOR CONTROLLING PUMPING ENGINES.

(Application filed Apr. 4, 1902.)

2 Sheets-Sheet 2.

' (No Model.)

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UNITED STATES PATENT OFFICE.

ROGER WRIGHT, OF NEWCASTLE-UPON-TYNE, ENGLAND, ASSIGNOR TO W. G.ARMSTRONG, WHITWORTH AND COMPANY, LIMITED, OF ELSWIOK WORKS,NEWOASTLE-UPON-TYNE, ENGLAND.

APPARATUS FOR CONTROLLING PUMPING-ENGINES.

SPECIFICATION formingpart of Letters Patent No. 715,924, dated December16, 1902.

Application filed April 4, 1902. Serial No. 101,409- (No model.)

To all whowt it may concern.-

Be it known that I, ROGER WRIGHT, engineer, a subject of the KingofGreat Britain, residing at Elswick Works, Newcastle-upon-Tyne,England,have invented certain new and useful Improvements inApparatus for Controlling Puinping-Engines, of which the following is aspecification.

In hydraulic governors for automatically regulating the speed of steampumping-engines by the pressure in the delivery-pipe from the pumps itis usual to employ a spring-loaded plunger on the delivery-pipe todirectly actuate the throttle-valve.

According to this invention the throttlevalve is worked by a pair ofsteam-pistons acted on by live s'teamfrom the boilers, the admission ofthe steam to either piston being effected by a small valve actuated bythe spring-loaded plunger. provide a speed-governor driven from thecrank-shaft to act in conjunction with the hydraulic governor.

According to this invention the speed-gov ernor instead of havingseparate connections withthe valve, as heretofore, acts through the sameconnections as the hydraulic governor.

The arrangement is as follows: A hydraulic cylinder in constantcommunication with the delivery-pipe has a spring-loaded plunger, towhich a lever is pivoted. One arm of this lever is pivoted to a rodconnected to the speedgovernor, and the other arm is connectedby a rodto the control-lever, which actuates the throttle-valve of thepumping-engine. If, therefore, either the speed of the engine or thepressure in the delivery-pipe varies, the

governor-lever is turned about one or' other of its pivots, and thevalve is suitably moved.

The throttle-valve is preferably of the miter type, having at each end apiston Working in a small cylinder. Live steam is admitted to one orother of these cylinders by a controlling-valve, whose rod has pivotedto it the controlling-lever, one arm of which is connected, as abovementioned, to the governorlever, While the other arm is pivoted to therod of the throttle-valve. If, therefore, the

speed of the engine or the pressure in the de- It is also usual to therod h to the end j of the leverj.

livery-pipe varies, so that the governor-lever is moved, thecontrol-lever is moved also, at first turning about its pivot on thethrottlevalve rod, so shifting the control-valve, and thereby admittingsteam to one or other of the valve-cylinders, thus moving thethrottle-valve. The throttle-valve rod during its movement carries theend of the control-lever with it, so that the control-valve becomes ahuntingvalve and causes the throttlevalve to continue to open or close,as the case may be, until the speed and pressurebecome again normal.

By-pass pipes and a cock may be provided, so that sufficient steam canbe allowed to pass the throttle-valve when closed to cause the engine tocreep and not absolutely stop.

Figure 1 is a side elevation of the controlling mechanism, thecrank-shaft being shown in section. Fig. 2 is a vertical section of thethrottle-valve to a larger scale; and Fig. 3 is a section on the line 33, Fig. 2.

a is a hydraulic cylinder in constant communication with thedelivery-pipe from the pump, and b is a plunger working in it.

c is a spring whose lower end bears upon the collar b, fixed to theplunger 17. The plunger is prolonged upward and has a lever d pivoted atd to its upper end.

v e is the crank-shaft of the engine, driving through the bevel-gear ean ordinary speedgovernor f, which operates a lever g in the usualmanner. The lever g is pivoted at g, and its other end is connected byrods 9 g and the bell-crank lever g to the end (1 of the levergd, whoseother end (i is connected by The lever j is also pivoted atj j to therods 70' Z of the control-valve k and the throttle-valve l,respectively. The valve 70 is hollow and works in a valve-chest 10 whilethe ends of the valve Z work in cylinders Z Z Steam is admitted to thechest 70 from the steam-pipe m by the small pipe 70 The chest 70 has init ports leading to annular passages 10 70 7c. The passage k isconnected by the pipe 72 to the cylinder Z the passage 10 to theexhaust, andzi ahe passage 10 by the pipe 0 to the cylinder p is aby-pass pipe controlled by a cock p, admitting suflicient steam to theengine to allow it to creep and not absolutely stop even when thethrottle-valve is closed.

If the water-pressure in the delivery-pipe increases, the plunger brises and turns the lever d about the pivot 01 and, similarly, if thespeed of the engine increases the governorfpnlls the end 01 of the lever(1 downward, turning the lever about the pivot d. In either case the rodh is pushed upward. The first result of this is to turn the lever jabout the pivot 7' and pull the valve-rod k upward, thereby admittingsteam into the annular passage 766 and the cylinder P, so forcing thethrottle-valve downward and cutting off the steam. This movement of thethrottle-valve lowers the pivotj so that when the rod h again descends,owing to the decrease of the speed or water-pressure, steam is at onceadmitted to the cylinder and the throttle-valve is opened.

What I claim is 1. The combination of a throttle-valve, a cylinder, apiston in the cylinder operating the throttle-valve, a valve admittingsteam to the cylinder, stems to the valves, a pressure-governor, and alever connected to the two valve-stems and to the governor, thearrangement being such that the steam admitted to the cylinder by themovement of the admission-valve in one direction tends to move thethrottle-valve in the opposite direction.

2. The combination of a throttle-valve, a cylinder, a piston in thecylinder operating the throttle-valve, a valve admitting steam to thecylinder, stems to the valves, a speedgovernor, and a lever connected tothe two valve-stems and to the governor, the arrangement being such thatthe steam admitted to the cylinder by the movement of theadmission-valve in one direction tends to move the throttle-valve in theopposite direction.

3. The combination of a throttle-valve, a cylinder, a piston in thecylinder operating the throttle-valve, a valve admitting steam to thecylinder, stems to the valves, a pressure-governor, a speed-governor,and a lever connected to the two valve-stems and to the two governors.

4. The combination of a throttle-valve, a cylinder, a piston in thecylinder operating the throttle-valve, a valve admitting steam to thecylinder, stems to the valves, a pressure-governor, a speed-governor, alever connected to the two valve-stems, and a second lever connected tothe two governors and to the first lever.

5. The combination of a throttle-valve, two cylinders in Which the endsof the throttlevalve work, a valve admitting steam to the two cylinders,stems fixed to the valves, alever pivoted to the stems, a second lever,a connecting-rod pivoted to the two levers, a hydraulic cylinderconstantly open to the pressure in the delivery-pipe, a plunger in thecylinder pivoted to the second lover, a spring acting on the plunger, aspeed-governor, and connections between it and the second lever.

ROGER WRIGHT.

Witnesses:

Z. D. FENWICK, CHARLES WEBSTER.

